It happens about four times a day, right under the nose of Peru's military: A small single-engine plane drops onto a dirt airstrip in the world's No. 1 coca-growing valley, delivers a bundle of cash, picks up more than 300 kilos of cocaine and flies to Bolivia.
Roughly half of Peru's cocaine exports have been ferried eastward on this "air bridge," police say, since the rugged Andean nation became the world's leading producer of the drug in 2012.
Peru's government has barely impeded the airborne drug flow. Prosecutors, narcotics police, former military officers . . .
